11222121121 has 4 divisors (see below), whose sum is σ = 11257522452. Its totient is φ = 11186719792.

The previous prime is 11222121047. The next prime is 11222121143. The reversal of 11222121121 is 12112122211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1985950096 + 9236171025 = 44564^2 + 96105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11222121121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222121095 and 11222121104.

It is not an unprimeable number, because it can be changed into a prime (11222125121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17700190 + ... + 17700823.

It is an arithmetic number, because the mean of its divisors is an integer number (2814380613).

Almost surely, 2^11222121121 is an apocalyptic number.

It is an amenable number.

11222121121 is a deficient number, since it is larger than the sum of its proper divisors (35401331).

11222121121 is an equidigital number, since it uses as much as digits as its factorization.

11222121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35401330.

The product of its digits is 32, while the sum is 16.

Adding to 11222121121 its reverse (12112122211), we get a palindrome (23334243332).

The spelling of 11222121121 in words is "eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".